The DOI matches its Crossref record; 42 of the 42 references it cites were found in a registry or an index.
A giant comet-like cloud of hydrogen escaping the warm Neptune-mass exoplanet GJ 436b
Open accessAbstract
Exoplanets orbiting close to their parent stars may lose some fraction of their atmospheres because of the extreme irradiation. Atmospheric mass loss primarily affects low-mass exoplanets, leading to the suggestion that hot rocky planets might have begun as Neptune-like, but subsequently lost all of their atmospheres; however, no confident measurements have hitherto been available. The signature of this loss could be observed in the ultraviolet spectrum, when the planet and its escaping atmosphere transit the star, giving rise to deeper and longer transit signatures than in the optical spectrum. Here we report that in the ultraviolet the Neptune-mass exoplanet GJ 436b (also known as Gliese 436b) has transit depths of 56.3 ± 3.5% (1σ), far beyond the 0.69% optical transit depth. The ultraviolet transits repeatedly start about two hours before, and end more than three hours after the approximately one hour optical transit, which is substantially different from one previous claim (based on an inaccurate ephemeris). We infer from this that the planet is surrounded and trailed by a large exospheric cloud composed mainly of hydrogen atoms. We estimate a mass-loss rate in the range of about 108–109 grams per second, which is far too small to deplete the atmosphere of a Neptune-like planet in the lifetime of the parent star, but would have been much greater in the past.
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Cites
An extended upper atmosphere around the extrasolar planet HD209458b
Vidal-Madjar, A., des Etangs, A. L., Désert, J.-M., Ballester, G. E., Ferlet, R., Hébrard, G., & Mayor, M. (2003) · Nature · doi:10.1038/nature01448 · Cited by 1,208
Self-citationRibas, I., Guinan, E. F., Gudel, M., & Audard, M. (2005) · The Astrophysical Journal · doi:10.1086/427977 · Cited by 855
KEPLER'S FIRST ROCKY PLANET: KEPLER-10b
Batalha, N. M., Borucki, W. J., Bryson, S. T., Buchhave, L. A., Caldwell, D. A., Christensen-Dalsgaard, J., Ciardi, D., Dunham, E. W., Fressin, F., Gautier, T. N., et al. (2011) · The Astrophysical Journal · doi:10.1088/0004-637x/729/1/27 · Cited by 531
Estimation of the XUV radiation onto close planets and their evaporation
Sanz-Forcada, J., Micela, G., Ribas, I., Pollock, A. M. T., Eiroa, C., Velasco, A., Solano, E., & García-Álvarez, D. (2011) · Astronomy & Astrophysics · doi:10.1051/0004-6361/201116594 · Cited by 407
Lopez, E. D., Fortney, J. J., & Miller, N. (2012) · The Astrophysical Journal · doi:10.1088/0004-637x/761/1/59 · Cited by 400
Lopez, E., Fortney, J. J., & Miller, N. (2012) · Cited by 365
A featureless transmission spectrum for the Neptune-mass exoplanet GJ 436b
Knutson, H. A., Benneke, B., Deming, D., & Homeier, D. (2014) · Nature · doi:10.1038/nature12887 · Cited by 343
Kepler's First Rocky Planet: Kepler-10b
Seager, S. (2010) · DSpace@MIT (Massachusetts Institute of Technology) · Cited by 332
METALS IN THE EXOSPHERE OF THE HIGHLY IRRADIATED PLANET WASP-12b
Fossati, L., Haswell, C. A., Froning, C. S., Hebb, L., Holmes, S., Kolb, U., Helling, C., Carter, A., Wheatley, P., Cameron, A. C., et al. (2010) · The Astrophysical Journal · doi:10.1088/2041-8205/714/2/l222 · Cited by 331
Self-citationOBSERVATIONS OF MASS LOSS FROM THE TRANSITING EXOPLANET HD 209458b
Linsky, J. L., Yang, H., France, K., Froning, C. S., Green, J. C., Stocke, J. T., & Osterman, S. N. (2010) · The Astrophysical Journal · doi:10.1088/0004-637x/717/2/1291 · Cited by 330
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Metadata
- Authors
- Ehrenreich, D., Bourrier, V., Wheatley, P. J., des Etangs, A. L., Hébrard, G., Udry, S., Bonfils, X., Delfosse, X., Désert, J.-M., Sing, D. K., & Vidal-Madjar, A.
- Venue
- Nature
- Published
- 2015-06
- Volume
- 522
- Issue
- 7557
- Pages
- 459-461
- ISSN
- 0028-0836 (ISSN-L)
- 1476-4687
- OpenAlex
- W1604168172
- Cited by
- 517
- References
- 42
- FWCI
- 33.57
- Type
- journal article
- Language
- en
- Open access
- green
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- Ehrenreich, D., Bourrier, V., Wheatley, P. J., des Etangs, A. L., Hébrard, G., Udry, S., Bonfils, X., Delfosse, X., Désert, J.-M., Sing, D. K., & Vidal-Madjar, A. (2015). A giant comet-like cloud of hydrogen escaping the warm Neptune-mass exoplanet GJ 436b. Nature. https://doi.org/10.1038/nature14501
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